2 Cor. 11:20 has received too little discussion in the literature on Paul's opponents at Corinth, and, surprizingly, even less notice in recent research on patron-client relations in the Pauline communities. This paper argues that 2 Cor. 11:20 depicts the leading figure among Paul's apostolic rivals as an instance of a social type so familiar and loathsome that he was a favorite subject of ridicule in comedy, mime and satire: the parasite, specifically, the "august parasite" (semnoparasitos), who puts on airs, and abuses his host and other guests. A composite portrait of this stock character is drawn from the comedies of Plautus, Terence, Alexis, Antiphanes, and from Lucian's satirical defense of the parasitic art. Parallels to Paul's vocabulary (katadouloun, katesthiein, lambanein, etc.) are traced in Greco-Romn comedies and satires. Paul's satirical account of the behavior of a rival missionary in 2 Cor. 11:20 serves not only as a foil to Paul's own modest conduct, but also functions as a reproach to the Corinthians for their complaisant response to the interloper. This hortatory function must be borne in mind as one seeks to comprehend the roles that Paul, his rival, and the Corinthians play in the little scenario Paul has constructed.